William Michael Tolbert (born November 23, 1985) is an American football fullback for the Buffalo Bills of the National Football League (NFL). He was signed by the San Diego Chargers as an undrafted free agent in 2008. He played college football for Coastal Carolina University. He has also been a member of the Carolina Panthers, where he was a three-time Pro Bowler and two-time first-team All-Pro. He signed with the Buffalo Bills in 2017 after being released by the Carolina Panthers.